ESiWACE2 Service 1 aims to support the exascale preparations for the weather and climate modelling community in Europe. We create short collaboration projects that provide guidance, engineering, and advice to improve model efficiency and port models to existing and upcoming computing infrastructure. All groups developing and maintaining weather and climate codes - not only the ESiWACE2 partners - can apply. The projects, funded by ESiWACE2, will be granted in-kind contributions by the Netherlands eScience Center and/or Atos-Bull. So if you are developing a weather / climate model and are looking for guidance, engineering, and advice to prepare your code for new hardware platforms, such as GPUs, please submit an application to this call!